Liu Bei, every time he fails, he will take refuge in Cao Cao, which is to hide his strength and bide his time. To put it bluntly, he is afraid of death. Out of selfishness, he went to crusade against Wu Dong under the banner of revenge for his second brother, and made up with Wu Dong after his failure. Isn't that obvious selfishness? Despite Lu Bu's entreaties, the White Gate Tower suggested to Cao Cao that Lu Bu should be executed. This is typical self-destruction.